Generator object "next" method takes optional send value

src/generator.js

Index: src/generator.js
diff --git a/src/generator.js b/src/generator.js
index 5e61091565567bf9d516a45d0efd72add6aa33af..cc31a44588412380a32e626f70ae16abbd90aa29 100644
--- a/src/generator.js
+++ b/src/generator.js
@@ -34,26 +34,16 @@
 // ----------------------------------------------------------------------------
 
 
-// TODO(wingo): Give link to specification. For now, the following diagram is
-// the spec:
-// http://wiki.ecmascript.org/lib/exe/fetch.php?cache=cache&media=harmony:es6_generator_object_model_3-29-13.png
+// Generator functions and objects are specified by ES6, sections 15.19.3 and
+// 15.19.4.
 
-function GeneratorObjectNext() {
+function GeneratorObjectNext(value) {
   if (!IS_GENERATOR(this)) {
     throw MakeTypeError('incompatible_method_receiver',
                         ['[Generator].prototype.next', this]);
   }
 
-  return %_GeneratorSend(this, void 0);
-}
-
-function GeneratorObjectSend(value) {
-  if (!IS_GENERATOR(this)) {
-    throw MakeTypeError('incompatible_method_receiver',
-                        ['[Generator].prototype.send', this]);
-  }
-
-  return %_GeneratorSend(this, value);
+  return %_GeneratorNext(this, value);
 }
 
 function GeneratorObjectThrow(exn) {
@@ -71,7 +61,6 @@ function SetUpGenerators() {
   InstallFunctions(GeneratorObjectPrototype,
                    DONT_ENUM | DONT_DELETE | READ_ONLY,
                    ["next", GeneratorObjectNext,
-                    "send", GeneratorObjectSend,
                     "throw", GeneratorObjectThrow]);
   %SetProperty(GeneratorObjectPrototype, "constructor",
                GeneratorFunctionPrototype, DONT_ENUM | DONT_DELETE | READ_ONLY);